Hydraulic unit of electronic control brake system

ABSTRACT

A hydraulic unit of an electronic control brake system is disclosed. The hydraulic unit of the electronic control brake system includes a modulator block having a plurality of accommodating bores in which a plurality of valves and pressure sensors coupled to a master cylinder to control braking hydraulic pressure supplied towards vehicle wheels are installed. Passages connecting between the accommodating bores are formed in the modulator block, and the passages are formed to be divided into two layers.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.16/565,445 filed on Sep. 9, 2019, which is a continuation of U.S. patentapplication Ser. No. 14/884,741 filed on Oct. 15, 2015, now issued asU.S. Pat. No. 10,407,040 dated Sep. 10, 2019, which claims the benefitof Korean Patent Application No. 10-2014-0140753, filed on Oct. 17, 2014in the Korean Intellectual Property Office, the disclosure of which isincorporated herein by reference.

BACKGROUND 1. Field

The present invention relates to a hydraulic unit of an electroniccontrol brake system, and more specifically, to a hydraulic unit of anelectronic control brake system for controlling brake pressure in abrake system through an electronic control.

2. Description of the Related Art

An electronic control brake system for efficiently preventing a slipthat may be generated at the time of braking of a vehicle, suddenunintended acceleration, or sudden acceleration, generally includes notonly a booster for a brake system of a vehicle, a master cylinder, and awheel cylinder, but also a hydraulic unit for controlling a brakinghydraulic pressure and an electronic control unit for controlling thehydraulic unit.

Recently, a system for obtaining a more powerful and stable brakingforce has been proposed, for example, an integrated dynamic brake (IDB)system has been proposed. The proposed IDB system generates a stable andpowerful braking force by integrating a master cylinder, a booster, andan electronic stability control (ESC).

This IDB system includes a pressure supplying device which operates amotor by outputting an operation of a brake pedal as an electricalsignal through a pedal displacement sensor and converts rotational forceof the motor into linear motion; and a hydraulic unit having a modulatorblock having a plurality of valves to control a brake operation byreceiving hydraulic pressure using a force generated by the pressuresupplying device. Herein, the hydraulic unit includes a plurality ofinflow/outflow valves, a shut-off valve, a switching valve, a checkvalve, a pressure sensor, a pedal simulation valve, and the like, tocontrol a braking hydraulic pressure transmitted towards wheel cylinderseach provided in vehicle wheels, and the these components are compactlyinstalled in the modulator block formed of aluminum. Also, a pluralityof valve bores, a port for connecting the master cylinder with the wheelcylinder, and a plurality of passages for guiding a direction ofhydraulic flow are processed to compactly install the plurality ofcomponents in the modulator block.

However, since a conventional hydraulic unit has an unnecessary deadspace other than a space in which a plurality of components arearranged, an improved arrangement structure of the components isrequired. Since a modulator block increased in size is arranged, a sizeand weight of a hydraulic unit is increased, and thus there is a problemof increasing costs.

Also, a lack of symmetry between two hydraulic circuits formed in themodulator block generates a pressure deviation, so there is a problem ofdecreasing durability due to generation of noise and vibration.

A hydraulic unit of an electronic control brake system according to anembodiment of the present invention can minimize a size of a modulatorblock by arranging passages, formed in the modulator block, in twolayers, and minimize a pressure deviation by making a structure of twohydraulic circuits symmetric to each other.

SUMMARY

Therefore, it is an aspect of the present invention to provide ahydraulic unit of an electronic control brake system according to anembodiment of the present invention capable of minimizing a size of amodulator block by arranging passages, formed in the modulator block, intwo layers, and minimizing a pressure deviation by making a structure oftwo hydraulic circuits symmetric to each other.

Additional aspects of the invention will be set forth in part in thedescription which follows and, in part, will be obvious from thedescription, or may be learned by practice of the invention.

In accordance with one aspect of the present invention, there isprovided a hydraulic unit of an electronic control brake system, whichincludes a modulator block having a plurality of accommodating bores inwhich a plurality of valves and pressure sensors, coupled to a mastercylinder to control braking hydraulic pressure supplied towards vehiclewheels, are installed, wherein passages connecting between theaccommodating bores are formed in the modulator block, and the passagesare formed to be divided into two layers.

Also, the modulator block may be formed to have two hydraulic circuits,and the plurality of accommodating bores and the passages forming thetwo hydraulic circuits may be formed laterally symmetric with respect tothe center of the modulator block.

Also, the accommodating bores in which an inflow valve, an outflowvalve, a shut-off valve, a simulation valve, pressure sensors, and aswitching valve are installed may be formed on one surface of themodulator block, and the accommodating bore in which a check valve isinstalled may be formed on the other surface of the modulator block.

Also, the plurality of accommodating bores, formed on one surface of themodulator block, may have the inflow valve, the outflow valve, theshut-off valve, the simulation valve, the pressure sensors, and theswitching valve installed in order.

Also, the accommodating bore in which the check valve is accommodatedmay be formed to be positioned between the shut-off valve and theswitching valve.

Also, the modulator block may have a master cylinder connecting unit, areservoir connecting unit, a pedal simulator connecting unit, and apressure supplying device connecting unit further formed on the othersurface of the modulator block.

Also, the reservoir connecting unit, the pedal simulator connectingunit, and the pressure supplying device connecting unit may bepositioned on a central line of the modulator block separating the twohydraulic circuits. The reservoir connecting unit and the pressuresupplying device connecting unit may be connected to the two hydrauliccircuits through the passages.

Also, a wheel cylinder connecting unit may be formed in a side surfacebetween one surface and the other surface of the modulator block.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects of the invention will become apparent andmore readily appreciated from the following description of theembodiments, taken in conjunction with the accompanying drawings ofwhich:

FIG. 1 is a hydraulic circuit diagram illustrating an electronic controlbrake system according to an exemplary embodiment of the presentinvention;

FIG. 2 is a perspective view illustrating a modulator block configuringa hydraulic unit of the electronic control brake system according to theexemplary embodiment of the present invention;

FIG. 3 is a plan view illustrating an upper side of the modulator blockshown in FIG. 2 ;

FIG. 4 is a bottom view illustrating a lower side of the modulator blockshown in FIG. 2 ; and

FIG. 5 is a side cross-sectional view of the modulator block shown inFIG. 2 .

DETAILED DESCRIPTION

Reference will now be made in detail to the embodiments of the presentinvention, examples of which are illustrated in the accompanyingdrawings, wherein like reference numerals refer to like elementsthroughout. Therefore, the prevent invention is not limited to thedrawings set forth below, and may be embodied in different forms, andthe drawings set forth below may be exaggerated in order to clarify thespirit of the present invention.

FIG. 1 is a hydraulic circuit diagram illustrating an electronic controlbrake system according to an exemplary embodiment of the presentinvention.

Referring to the drawing, the electronic control brake system appliedwith the present invention includes: a master cylinder 20 for generatinghydraulic pressure; a reservoir 30 coupled to an upper part of themaster cylinder 20 to store oil; wheel cylinders 40 each installed onvehicle wheels RR, RL, FR, and FL to brake using the transmittedhydraulic pressure; a hydraulic pressure supplying device 50mechanically operated by receiving, as an electrical signal, a brakingintention of a driver from a pedal displacement sensor 11 detectingdisplacement of a brake pedal 10; a hydraulic unit 70 for controllingthe hydraulic pressure to brake the vehicle wheels with a forcegenerated by the hydraulic pressure supplying device 50; and a pedalsimulator 60 connected with the master cylinder 20 to provide a reactionforce for the brake pedal 10.

At this time, the master cylinder 20 may consist of at least one chamberto generate a hydraulic pressure, but, according to that shown, isprovided so as to have two hydraulic pressure units 20 a and 20 b. Sincethe master cylinder 20 has the two hydraulic pressure units 20 a and 20b, the master cylinder 20 can secure safety by operating the otherhydraulic pressure unit when one of the hydraulic pressure unitsmalfunctions.

The hydraulic pressure supplying device 50 includes a cylinder 51 havinga predetermined space to receive and store oil; and a ball screw member54 for pressuring a piston 52 provided in the cylinder 51 by convertingrotational force of a motor 55 into linear motion. That is, the motor 55generates the rotational force by the signal detected by the pedaldisplacement sensor 11, and the ball screw member 54 converts rotationalmotion into linear motion to pressurize the piston 52, and thus thehydraulic pressure supplying device 50 generates braking hydraulicpressure. The ball screw member 54, which is a device for converting therotational motion into the linear motion, is a widely well-knowntechnique, so a detailed description will be omitted.

Meanwhile, a non-illustrated reference numeral ‘85 a’ is a firstpressure sensor for detecting the hydraulic pressure of a cylinder 51,and a reference numeral ‘85 b’ is a second pressure sensor for measuringthe oil pressure of the master cylinder 20.

The pedal simulator 60 is connected to the master cylinder 20 to providea reaction force according to the pedal pressure applied to the brakepedal 10. The pedal simulator 60 includes: a simulation chamber 61provided to store the oil discharged from the master cylinder 20; areaction piston 62 provided in the simulation chamber 61; a reactionspring 63 for elastically supporting the reaction piston 62; and asimulation valve 64 connected to a rear end part of the simulationchamber 61. The simulation valve 64 is installed in a modulator block 80of the hydraulic unit 70 to be described below, and the structure willbe described below again.

According to the present invention, the hydraulic unit 70 includes themodulator block 80 having a hydraulic circuit controlling to transmitthe braking hydraulic pressure to the wheel cylinders 40 each installedin vehicle wheels FL, FR, RL, and RR.

At this time, the hydraulic circuit includes a first hydraulic circuit70A for controlling the transmission of hydraulic pressure by connectingthe hydraulic pressure unit 20 a, one of the pair of hydraulic pressureunits 20 a and 20 b of the master cylinder 20, with the wheel cylinders40 provided on two vehicle wheels FR and RL; and a second hydraulicpressure circuit 70B for controlling the transmission of hydraulicpressure by connecting the other hydraulic pressure unit 20 b with thewheel cylinders 40 provided on the other vehicle wheels FL and RR. Thefirst and second hydraulic circuits 70A and 70B are compactly installedin the modulator block 80.

Each of the hydraulic circuits 70A and 70B, for controlling thehydraulic pressure transmitted to each of the vehicle wheels FL, FR, RL,and RR, includes passages 180 formed in the modulator block 80 andconnected to the master cylinder 20, the reservoir 30, the wheelcylinders 40, the hydraulic pressure supplying device 50, and the pedalsimulator 60; and a plurality of valves 64, 81, 82, 83, 84, and 86 andthe pressure sensors 85 a and 85 b installed in the modulator block 80to be connected with the passages 180.

More specifically, the plurality of valves 64, 81, 82, 83, 84, and 86includes: inflow valves 81 provided as a normal open type (hereafter,referred as ‘NO type’) solenoid valve arranged on upper sides of thewheel cylinders 40 to control the transmission of the hydraulic pressureto the wheel cylinders 40; outflow valves 82 prepared as a normal closedtype (hereafter, referred as ‘NC type’) solenoid valve arranged on lowersides of the wheel cylinders 40 to control the discharging of thehydraulic pressure from the wheel cylinders 40; switching valves 84 andcheck valves 86 each provided in the passages 180 connecting thehydraulic pressure supplying device 50 with the hydraulic circuits 70Aand 70B to control the hydraulic pressure transmitted to the wheelcylinder 40 by an opening and closing operation; a pair of shut-offvalves 83 provided in the passages 180 of the hydraulic circuits 70A and70B connecting between the master cylinder 20 and the wheel cylinders 40and controlling the hydraulic pressure transmitted to the wheelcylinders 40 by an opening and closing operation; and a simulation valve64 provided in the passage 180 connecting the simulation chamber 61 andthe reservoir 30. At this time, the pressure sensor 85 b for measuringthe oil pressure of the master cylinder 20 may be provided between theshut-off valve 83 and the master cylinder 20. Therefore, at the time ofbraking by a driver, the passages are blocked by the shut-off valves 83,and a braking intention that the driver requires may be determined bythe pressure sensor 85 b.

The switching valve 84 may be provided as a NO type solenoid valve whichis closed in a normal state and is opened when receiving an openingsignal. The shut-off valve 83 may be provided as an NC type solenoidvalve which is open in a normal state and is closed when receiving aclosing signal from an electronic control unit (not shown).

Meanwhile, the check valves 86 are installed in the passages connectingthe pressure chamber of cylinder 51 of the hydraulic pressure supplyingdevice 50 with hydraulic circuits 70A and 70B, and are installed inparallel to the pair of switching valves 84, respectively. The checkvalve 86, which is a unidirectional check valve provided so as totransmit the hydraulic pressure only to the wheel cylinder 40, preventsa pressure from being increased due to an operation delay of theswitching valve 84.

Opening and closing operations of valves 64, 81, 82, 83, 84, and 86 arecontrolled by the electronic control unit.

The hydraulic unit 70 has the passages 180 formed in and passing throughthe modulator block 80 so as to connect the master cylinder 20, thereservoir 30, the wheel cylinder 40, the hydraulic pressure supplyingdevice 50, and the pedal simulator 60, and has the valves 64, 81, 82,83, 84, and 86 compactly installed to control the braking hydraulicpressure through the passages 180.

Next, the hydraulic unit 70 provided in the electronic control brakesystem will be described in more detail with reference to FIGS. 2 to 5 .That is, according to an aspect of the present invention, an arrangementstructure of a plurality of accommodating bores, into which theplurality of valves 64, 81, 82, 83, 84, and 86 and the pressure sensors85 a and 85 b of the modulator block 80 are installed, and the passages180 for connecting the plurality of accommodating bores will bedescribed.

FIG. 2 is a perspective view illustrating a modulator block configuringa hydraulic unit of the electronic control brake system according to theexemplary embodiment of the present invention, FIG. 3 is a plan viewillustrating an upper side of the modulator block shown in FIG. 2 , FIG.4 is a bottom view illustrating a lower side of the modulator blockshown in FIG. 2 , and FIG. 5 is a side cross-sectional view of themodulator block shown in FIG. 2 .

At this time, an upper surface F1, a lower surface F2, and a sidesurface F3 for providing a direction of the modulator block 80 are setwith respect to the modulator block 80 shown in FIG. 2 to assist inunderstanding the present invention, and this is not limited thereto. Itshould be understood that a surface for providing a direction of themodulator block 80 may be changed depending on a position in which themodulator block 80 is installed.

Referring to FIGS. 2 to 5 , the modulator block 80 has a hexahedralshape. The modulator block 80 includes the plurality of accommodatingbores 164, 181, 182, 183, 184, 185, and 186 into which the plurality ofvalves 64, 81, 82, 83, 84, and 86 and the pressure sensors 85 a, and 85b are installed; and the passages 180 for connecting between theaccommodating bores 164, 181, 182, 183, 184, 185, and 186. That is, themodulator block 80 includes the accommodating bores 164, 181, 182, 183,184, 185, and 186 and the passages 180 formed on opposite sides withrespect to a central line C to configure two hydraulic circuits 70A and70B.

More specifically, the accommodating bores 164, 181, 182, 183, 184, and185, into which the inflow valve 81, the outflow valve 82, the shut-offvalve 83, the simulation valve 64, the pressure sensors 85 a and 85 b,and the switching valve 84 are installed, are formed on one surface ofthe modulator block 80, that is, the upper surface F1. The accommodatingbore 186, into which the check valve 86 is installed, is formed on theother surface of the modulator block 80, that is, the lower surface F2.Also, the passages 180 connecting between the accommodating bores 164,181, 182, 183, 184, 185, and 186 are formed in the modulator block 80.At this time, as shown in FIG. 5 , the passages 180 are formed to bedivided into two layers P1 and P2.

Meanwhile, the inflow valve 81, the outflow valve 82, the shut-off valve83, the simulation valve 64, the pressure sensors 85 a, and 85 b, andthe switching valve 84 are installed in the accommodating bores 164,181, 182, 183, 184, and 185, formed in the upper surface F1 of themodulator block 80, in order. As shown, a plurality of firstaccommodating bores 181 of a first valve row L1 into which the pluralityof inflow valves 81 are installed, a plurality of second accommodatingbores 182 of a second valve row L2 into which the plurality of outflowvalves 82 are installed, a plurality of third accommodating bores 183 ofa third valve row L3 into which the plurality of shut-off valves 83 areinstalled, and a plurality of fourth accommodating bores 184 of a fourthvalve row L4 into which the plurality of switching valves 84 areinstalled are formed in the upper surface F1 of the modulator block 80.At this time, the accommodating bore 164 into which the simulation valve64 is installed is formed between the third accommodating bores 183 inthe third valve row L3. That is, the accommodating bore 164 into whichthe simulation valve 64 is installed is formed to be positioned on thecentral line C of the modulator block 80. The accommodating bores 164,181, 182, 183, and 184 formed in the first to fourth valve rows L1 to L4are arranged on the upper surface F1 of the modulator block 80 in atransverse direction perpendicular to the central line C.

Also, in the upper surface F1 of the modulator block 80, a plurality ofaccommodating bores 185 into which the pressure sensors 85 a and 85 bare installed are formed between the third valve row L3 and the fourthvalve row L4 in a transverse direction.

Further, in the lower surface F2 of the modulator block 80, theplurality of accommodating bores 186 into which the plurality of checkvalves 86 are installed are formed between the third valve row L3 andthe fourth valve row L4 in a transverse direction. The accommodatingbores 185 into which the pressure sensors 85 a and 85 b are installedand the accommodating bores 186 into which the check valves 86 areinstalled are alternately positioned to maximize the use of an innerspace of the modulator block 80.

A master cylinder connecting unit 120, a reservoir connecting unit 130,a pedal simulator connecting unit 160, and a pressure supplying deviceconnecting unit 150 are formed in the lower surface F2 of the modulatorblock 80. That is, the master cylinder connecting unit 120 is connectedwith the master cylinder 20. The reservoir connecting unit 130 isconnected with the reservoir 30. The pedal simulator connecting unit 160is connected with the pedal simulator 60. The pressure supplying deviceconnecting unit 150 is connected with the hydraulic pressure supplyingdevice 50. The reservoir connecting unit 130, the pedal simulatorconnecting unit 160, and the pressure supplying device connecting unit150 are formed at the central line C of the modulator block 80separating the two hydraulic circuits 70A and 70B. At this time, thereservoir connecting unit 130 and the pressure supplying deviceconnecting unit 150 are connected with the hydraulic circuits 70A and70B through the passages 180. Also, the pedal simulator connecting unit160 is formed at a lower side of the accommodating bore 164 into whichthe simulation valve 64, formed in the upper surface F1 of the modulatorblock 80, is installed, and the master cylinder connecting unit 120 isformed at a lower side of the accommodating bore 183 into which theshut-off valve 83 is installed.

Meanwhile, a wheel cylinder connecting unit 140 is formed in a sidesurface between the upper surface F1 and the lower surface F2 of themodulator block 80. It is preferable that the wheel cylinder connectingunit 140 is formed in the side surface F3 of the modulator block 80adjacent to the inflow valve accommodating bore 181 to easily controlthe braking hydraulic pressure flowing along the passages 180.

As described above, the accommodating bores 164, 181, 182, 183, 184,185, and 186 and the passages 180 formed in the modulator block 80 arearranged to be laterally symmetric with respect to the central line C ofthe modulator block 80. Therefore, a pressure deviation between the twohydraulic circuits 70A and 70B may be minimized. Also, the passages 180connected with the accommodating bores 164, 181, 182, 183, 184, 185, and186, as shown in FIG. 5 , are arranged in two layers P1 and P2, therebyminimizing costs for manufacturing the modulator block 80, and reducinga size and weight of the modulator block 80.

The hydraulic unit of the electronic control brake system according toan embodiment of the present invention can simplify a structure ascompared with the conventional one by arranging the passages 180, formedin a modulator block 80, in two layers, and also can reduce weight andcosts by minimizing a size of the modulator block 80.

Also, the two hydraulic circuits configured of the plurality of valves64, 81, 82, 83, 84, and 86 and the passages 180 installed in themodulator block 80 are formed to be symmetrical to each other, therebyminimizing a pressure deviation between the hydraulic circuits 70A and70B.

Further, the plurality of valves 64, 81, 82, 83, 84, and 86 forcontrolling the flow of the braking hydraulic pressure are compactlyinstalled in the modulator block 80 by improving an installationposition of the valves 64, 81, 82, 83, 84, and 86, thereby using a sizeof the modulator block 80.

As described above, although the present invention has been describedwith reference to exemplary embodiments and the accompanying drawings,it would be appreciated that the present invention is not limitedthereto, but various modifications and alterations might be made by aperson skilled in the art to which the present invention pertain withoutdeparting from the scope defined in the claims and their equivalents.

What is claimed is:
 1. A hydraulic unit of an electronic control brakesystem, comprising: a modulator block having: a plurality ofaccommodating bores in which a plurality of valves and a pressure sensorhydraulically coupled to a master cylinder to control braking hydraulicpressure supplied to vehicle wheels are disposed; and passagesconnecting between the plurality of accommodating bores, the passagesformed in the modulator block, wherein the plurality of accommodatingbores comprise: an inflow valve accommodating bore, an outflow valveaccommodating bore, a shut-off valve accommodating bore, a simulationvalve accommodating bore, and a pressure sensor accommodating bore whichare formed on a first surface of the modulator block; a check valveaccommodating bore formed on a second surface of the modulator block;and wheel cylinder connecting bores formed on a third surface of themodulator block, the wheel cylinder connecting bores connected withwheel cylinders installed at the vehicle wheels, and wherein the outflowvalve accommodating bore, the simulation valve accommodating bore, andthe shut-off valve accommodating bore are positioned in order.
 2. Thehydraulic unit of the electronic control brake system of claim 1,wherein an inflow valve disposed in the inflow valve accommodating boreis a normally open valve, and an outflow valve disposed in the outflowvalve accommodating bore is a normally closed valve.
 3. The hydraulicunit of the electronic control brake system of claim 1, wherein ashut-off valve disposed in the shut-off valve accommodating bore isconnected between the master cylinder and an inflow valve disposed inthe inflow valve accommodating bore.
 4. The hydraulic unit of theelectronic control brake system of claim 1, wherein the pressure sensordisposed in the pressure sensor accommodating bore is connected betweenthe master cylinder and a shut-off valve disposed in the shut-off valveaccommodating bore.
 5. The hydraulic unit of the electronic controlbrake system of claim 1, further comprising a hydraulic pressuresupplying device comprising a motor and a piston configured to bemovable by the motor to generate the braking hydraulic pressure to thevehicle wheels, wherein a switching valve is connected between thehydraulic pressure supplying device and an inflow valve disposed in theinflow valve accommodating bore.
 6. The hydraulic unit of the electroniccontrol brake system of claim 1, further comprising: a hydraulicpressure supplying device comprising a motor and a piston configured tobe movable by the motor to generate the braking hydraulic pressure tothe vehicle wheels; and another pressure sensor connected between thehydraulic pressure supplying device and a switching valve, wherein theswitching valve is connected between the hydraulic pressure supplyingdevice and an inflow valve disposed in the inflow valve accommodatingbore.
 7. The hydraulic unit of the electronic control brake system ofclaim 1, wherein a simulation valve disposed in the simulation valveaccommodating bore is connected between the master cylinder and areservoir.
 8. The hydraulic unit of the electronic control brake systemof claim 1, wherein inflow and outflow valves disposed in the inflow andoutflow valve accommodating bores are connected between a shut-off valvedisposed in the shut-off valve accommodating bore and one of the wheelcylinders installed at the vehicle wheels.
 9. A hydraulic unit of anelectronic control brake system, comprising: a modulator block having: aplurality of accommodating bores in which a plurality of valves and apressure sensor hydraulically coupled to a master cylinder to controlbraking hydraulic pressure supplied to vehicle wheels are disposed; andpassages connecting between the plurality of accommodating bores, thepassages formed in the modulator block, wherein the plurality ofaccommodating bores comprise: an inflow valve accommodating bore, anoutflow valve accommodating bore, a shut-off valve accommodating bore, asimulation valve accommodating bore, and a pressure sensor accommodatingbore which are formed on a first surface of the modulator block; a checkvalve accommodating bore formed on a second surface of the modulatorblock; and wheel cylinder connecting bores formed on a third surface ofthe modulator block, the wheel cylinder connecting bores connected withwheel cylinders installed at the vehicle wheels, and wherein thepressure sensor accommodating bore, the shut-off valve accommodatingbore, and the simulation valve accommodating bore are positioned inorder.
 10. The hydraulic unit of the electronic control brake system ofclaim 9, wherein an inflow valve disposed in the inflow valveaccommodating bore is a normally open valve, and an outflow valvedisposed in the outflow valve accommodating bore is a normally closedvalve.
 11. The hydraulic unit of the electronic control brake system ofclaim 9, wherein a shut-off valve disposed in the shut-off valveaccommodating bore is connected between the master cylinder and aninflow valve disposed in the inflow valve accommodating bore.
 12. Thehydraulic unit of the electronic control brake system of claim 9,wherein the pressure sensor disposed in the pressure sensoraccommodating bore is connected between the master cylinder and ashut-off valve disposed in the shut-off valve accommodating bore. 13.The hydraulic unit of the electronic control brake system of claim 9,further comprising a hydraulic pressure supplying device comprising amotor and a piston configured to be movable by the motor to generate thebraking hydraulic pressure to the vehicle wheels, wherein a switchingvalve is connected between the hydraulic pressure supplying device andan inflow valve disposed in the inflow valve accommodating bore.
 14. Thehydraulic unit of the electronic control brake system of claim 9,further comprising: a hydraulic pressure supplying device comprising amotor and a piston configured to be movable by the motor to generate thebraking hydraulic pressure to the vehicle wheels; and another pressuresensor connected between the hydraulic pressure supplying device and aswitching valve, wherein the switching valve is connected between thehydraulic pressure supplying device and an inflow valve disposed in theinflow valve accommodating bore.
 15. The hydraulic unit of theelectronic control brake system of claim 9, wherein a simulation valvedisposed in the simulation valve accommodating bore is connected betweenthe master cylinder and a reservoir.
 16. The hydraulic unit of theelectronic control brake system of claim 9, wherein inflow and outflowvalves disposed in the inflow and outflow valve accommodating bores areconnected between a shut-off valve disposed in the shut-off valveaccommodating bore and one of the wheel cylinders installed at thevehicle wheels.
 17. A hydraulic unit of an electronic control brakesystem, comprising: a modulator block having: a plurality ofaccommodating bores in which a plurality of valves and a pressure sensorhydraulically coupled to a master cylinder to control braking hydraulicpressure supplied to vehicle wheels are disposed; and passagesconnecting between the plurality of accommodating bores, the passagesformed in the modulator block, wherein the plurality of accommodatingbores comprise: an inflow valve accommodating bore, an outflow valveaccommodating bore, a shut-off valve accommodating bore, a simulationvalve accommodating bore, and a pressure sensor accommodating bore whichare formed on a first surface of the modulator block; and a reservoirbore connected with a reservoir and formed on a second surface of themodulator block, and wherein the outflow valve accommodating bore, thesimulation valve accommodating bore, and the shut-off valveaccommodating bore are positioned in order.
 18. The hydraulic unit ofthe electronic control brake system of claim 17, wherein a shut-offvalve disposed in the shut-off valve accommodating bore is connectedbetween the master cylinder and an inflow valve disposed in the inflowvalve accommodating bore.
 19. The hydraulic unit of the electroniccontrol brake system of claim 17, wherein the pressure sensor disposedin the pressure sensor accommodating bore is connected between themaster cylinder and a shut-off valve disposed in the shut-off valveaccommodating bore.
 20. The hydraulic unit of the electronic controlbrake system of claim 17, further comprising a hydraulic pressuresupplying device comprising a motor and a piston configured to bemovable by the motor to generate the braking hydraulic pressure to thevehicle wheels, wherein a switching valve is connected between thehydraulic pressure supplying device and an inflow valve disposed in theinflow valve accommodating bore.